Canon 70-200IS v. Sigma 70-200EX

Started May 2, 2005 | Discussions thread
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lwestfall Regular Member • Posts: 306
Testing request: Sigma zooms with the 580EX

How about the 24-70 EX? I think a good part of all these lens tests would be checking full functionality with the 20D & 580EX, which are not only popular but cutting-edge enough to serve as a good way to reveal flaws in Sigma's reverse engineering.

Peter A H wrote:

I have had both. The Sigma do not work with Canon 20D in low light
together with the flash (580EX). It can not focus properly, so I
had to get rid of the Sigma. If You study this, You will se more
that have had the same problem, so it is not only me.....

This is ome important reason not to go with the Sigma.....

Peter A H

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